body {
  margin: 0;
  font-family: Arial, sans-serif;
  display: grid;
  place-content: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #1d4ed8, #0ea5e9);
  color: #0f172a;
}

main {
  background: #ffffffdd;
  padding: 2rem;
  border-radius: 1rem;
  box-shadow: 0 10px 30px #0f172a33;
}